It comes from the control interface. People using tiny little keyboards on their phones, with Siri et al. correcting everything, often wrongly, grow quickly accustomed to TLAs, abbreviations, and newfangled shorthand.

People like me, who never learned to write longhand quickly but type fast, don't see the point of such stuff. Get the point across clearly, we think.

It's all communication. Not all of it is clear, but the Darwinistic evolution of efficient communication should be appreciated as natural.

In "the lost weekend"--hardly a new movie--there's a character who uses many of these same abbreviations and another character who makes some of these same complaints. Isn't cicero suppsed to have complained about kids today?